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Formaldehyde

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https://www.readbyqxmd.com/read/28102364/indefinitely-stable-iron-iv-cage-complexes-formed-in-water-by-air-oxidation
#1
Stefania Tomyn, Sergii I Shylin, Dmytro Bykov, Vadim Ksenofontov, Elzbieta Gumienna-Kontecka, Volodymyr Bon, Igor O Fritsky
In nature, iron, the fourth most abundant element of the Earth's crust, occurs in its stable forms either as the native metal or in its compounds in the +2 or +3 (low-valent) oxidation states. High-valent iron (+4, +5, +6) compounds are not formed spontaneously at ambient conditions, and the ones obtained synthetically appear to be unstable in polar organic solvents, especially aqueous solutions, and this is what limits their studies and use. Here we describe unprecedented iron(IV) hexahydrazide clathrochelate complexes that are assembled in alkaline aqueous media from iron(III) salts, oxalodihydrazide and formaldehyde in the course of a metal-templated reaction accompanied by air oxidation...
January 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28099805/the-importance-of-cannizzaro-type-reactions-during-electrocatalytic-reduction-of-carbon-dioxide
#2
Yuvraj Y Birdja, Marc T M Koper
A seemingly catalytic inactive electrode as boron doped diamond is found to be active for CO2 and CO reduction to formaldehyde and even methane. At very cathodic potentials formic acid and methanol are formed as well. However, these products are the result of base-catalyzed Cannizzaro-type disproportionation reactions. A local alkaline environment near the electrode surface, caused by the hydrogen evolution reaction, initiates aldehyde disproportionation promoted by hydroxide ions, which leads to the formation of the corresponding carboxylic acid and alcohol...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28098446/determination-of-carbonyl-compounds-in-cork-agglomerates-by-gdme-hplc-uv-identification-of-the-extracted-compounds-by-hplc-ms-ms
#3
Pedro Francisco Brandão, Rui Miguel Ramos, Paulo Joaquim Ferreira de Almeida, Jose António Rodrigues
A new approach is proposed for the extraction and determination of carbonyl compounds in solid samples, like wood or cork materials. Cork products are used as building materials due to its singular characteristics; however little is known about its aldehyde emission potential and content. Sample preparation was done by using a gas-diffusion microextraction (GDME) device, for the direct extraction of volatile aldehydes and derivatization with 2,4-dinitrophenylhydrazine. Analytical determination of the extracts was done by HPLC-UV, with detection at 360 nm...
January 18, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28095672/targeted-self-healing-by-magnetically-guiding-microcapsules
#4
Matthew D Crall, Michael W Keller
Magnetically guided microcapsules are used to achieve self-healing with of the healing components required using traditional self-healing approaches. Microcapsules are rendered responsive to magnetic fields by suspending magnetic nanoparticles in the core material. The nanoparticles are surface-modified to enable urea-formaldehyde encapsulation within a phenyl acetate core. Magnetic fields are used to guide the microcapsules to the expected fracture location in tapered double-cantilever beam (TDCB) epoxy specimens...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094961/enhancing-the-sensing-properties-of-tio2-nanosheets-with-exposed-001-facets-by-a-hydrogenation-and-sensing-mechanism
#5
Ye Wang, Junfang Liu, Miao Wang, Cuijin Pei, Bin Liu, Yukun Yuan, Shengzhong Liu, Heqing Yang
Hydrogenation is successfully employed to improve sensing performances of the gas sensors based on TiO2 nanosheets with exposed {001} facets for the first time. The hydrogenated TiO2 nanosheets show a significantly higher response toward ethanol, acetone, triethylamine, or formaldehyde than the samples without hydrogenation, and the response further increases with an increase of the hydrogenation temperature. The excellent sensing performances are ascribed to an increase of the density of unsaturated Ti5c atoms on the {001} surface resulting from the hydrogenation process...
January 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28093206/urea-formaldehyde-monolithic-column-for-hydrophilic-in-tube-solid-phase-microextraction-of-aminoglycosides
#6
Jiabin Wang, Qi Zhao, Nan Jiang, Wenbang Li, Li Chen, Xucong Lin, Zenghong Xie, Lijun You, Qiqing Zhang
A novel urea-formaldehyde (UF) monolithic column has been developed and exploited as a sorbent for hydrophilic in-tube solid-phase microextraction (in-tube SPME) of aminoglycosides (AGs). Because of the innate hydrophilicity, UF monolith showed high extraction efficiency towards these hydrophilic analytes. The adsorption capacities for target compounds dissolved in water/ACN (1:1, v/v) were in the range of 5.18-7.36μg/cm. Due to the lack of a chromophore, evaporative light scattering detector (ELSD) was selected as the detector for AGs, and coupled with the online in-tube SPME-HPLC system...
January 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28092831/dft-study-on-the-chemical-sensing-properties-of-b24n24-nanocage-toward-formaldehyde
#7
Zahra Rostami, Mansoureh Pashangpour, Reza Moradi
It has been previously shown that the toxic formaldehyde gas (H2CO) cannot be detected by pristine BC2N, carbon, and BN nanotubes, BC3 nanosheet and graphene. Herein, density functional theory calculations were employed to investigate the electronic and structural behavior of a pristine B24N24 nanocluster toward H2CO molecules. It was found that [4,6] BN bonds of the nanocluster are the most favorable sites for the H2CO adsorption, compared to the [4,8], and [6,8] ones. When an H2CO molecule is adsorbed on a [4,6] BN bond, an energy of about 16...
December 26, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28092054/sh2-domain-histochemistry
#8
Sophia Buhs, Peter Nollau
Among posttranslational modifications, the phosphorylation of tyrosine residues is a key modification in cell signaling. Because of its biological importance, characterization of the cellular state of tyrosine phosphorylation is of great interest. Based on the unique properties of endogenously expressed SH2 domains recognizing tyrosine phosphorylated signaling proteins with high specificity we have developed an alternative approach, coined SH2 profiling, enabling us to decipher complex patterns of tyrosine phosphorylation in various normal and cancerous tissues...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28090065/assessment-of-workplace-air-concentrations-of-formaldehyde-during-and-before-working-hours-in-medical-facilities
#9
Ichiro Higashikubo, Hiroyuki Miyauchi, Satoru Yoshida, Shinsuke Tanaka, Mitsunori Matsuoka, Heihachiro Arito, Akihiro Araki, Hidesuke Shimizu, Haruhiko Sakurai
Workplace air concentrations of formaldehyde (FA) in medical facilities where FA and FA-treated organs were stored and handled were measured before and during working hours and assessed by the official method specified by Work Environment Measurement Law. Sixty-percent of the total facilities examined were judged as inappropriately controlled work environment. The concentrations of FA before working hours by spot sampling were found to exceed 0.1 ppm in some facilities, and tended to increase with increasing volume of containers storing FA and FA-treated materials...
January 13, 2017: Industrial Health
https://www.readbyqxmd.com/read/28088856/hollow-carbon-spheres-with-abundant-micropores-for-enhanced-co2-adsorption
#10
Xuena Li, Shiyang Bai, Zhengjian Zhu, Ji-Hong Sun, Xiaoqi Jin, Xia Wu, Jian Liu
The interest in the design and controllable fabrication of hollow carbon spheres (HCSs) emanates from their tremendous potential applications in adsorption, energy conversion and storage, and catalysis. However, the effective synthesis of uniform HCSs with high surface area and abundant micropores remains a challenge. In this work, HCSs with tuneable microporous shells were rationally synthesized via hard-template method using resorcinol (R) and formaldehyde (F) as a carbon precursor. The HCSs with very high surface area (1369 m2/g) and abundant micropores (0...
January 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28088562/the-effect-of-high-temperature-sol-gel-polymerization-parameters-on-the-microstructure-and-properties-of-hydrophobic-phenol-formaldehyde-silica-hybrid-aerogels
#11
Mohamad Mehdi Seraji, Ghasem Sameri, Jamal Davarpanah, Ahmad Reza Bahramian
Phenol-formaldehyde/silica hybrid aerogels with different degree of hydrophobicity were successfully synthesized via high temperature sol-gel polymerization. Tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) were used as precursor and co-precursor of the hydrophobic silica-based phase, respectively. The hydrolysis step of silica based sols were conducted by acid catalyzed reactions and HCl was used as hydrolysis catalyst. The chemical structure of prepared hybrid aerogels was characterized by Fourier Transform Infrared spectroscopy (FT-IR)...
January 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28087758/method-for-the-determination-of-carbonyl-compounds-in-e-cigarette-aerosols
#12
Jason W Flora, Celeste T Wilkinson, James W Wilkinson, Peter J Lipowicz, James A Skapars, Adam Anderson, John H Miller
Low levels of thermal degradation products such as carbonyls (formaldehyde, acetaldehyde, acrolein, crotonaldehyde) have been reported in e-cigarette aerosols. The collection and analysis of e-cigarette aerosol carbonyls are often adapted from methods developed for tobacco cigarette smoke. These methodologies are often not sensitive enough to detect low carbonyl levels in e-cigarette aerosols. One objective of this work was to develop and validate a rapid, selective and sensitive ultra-performance liquid chromatography with mass spectrometry method optimized for analysis of carbonyls in e-cigarette aerosols...
February 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28079226/in-silico-kinetics-of-alkaline-hydrolysis-of-1-3-5-trinitro-1-3-5-triazinane-rdx-m06-2x-investigation
#13
L K Sviatenko, L Gorb, D Leszczynska, S I Okovytyy, M K Shukla, J Leszczynski
Alkaline hydrolysis of RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), as one of the most promising methods for nitrocompound remediation, was investigated computationally at the PCM(Pauling)/M06-2X/6-311++G(d,p) level of theory. Computational simulation shows that RDX hydrolysis is a highly exothermic multistep process involving initial deprotonation and nitrite elimination, cycle cleavage, further transformation of cycle-opened intermediates to end products caused by a series of C-N bond ruptures, hydroxide attachments, and proton transfers...
January 12, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28076380/a-device-independent-evaluation-of-carbonyl-emissions-from-heated-electronic-cigarette-solvents
#14
Ping Wang, Wenhao Chen, Jiawen Liao, Toshiki Matsuo, Kazuhide Ito, Jeff Fowles, Dennis Shusterman, Mark Mendell, Kazukiyo Kumagai
OBJECTIVES: To investigate how the two main electronic (e-) cigarette solvents-propylene glycol (PG) and glycerol (GL)-modulate the formation of toxic volatile carbonyl compounds under precisely controlled temperatures in the absence of nicotine and flavor additives. METHODS: PG, GL, PG:GL = 1:1 (wt/wt) mixture, and two commercial e-cigarette liquids were vaporized in a stainless steel, tubular reactor in flowing air ranging up to 318°C to simulate e-cigarette vaping...
2017: PloS One
https://www.readbyqxmd.com/read/28074743/synthesis-of-nanoporous-carbon-for-fast-uptake-of-cr-vi-and-ni-ii-from-aqueous-solution
#15
Imed Ghiloufi
Nanoporous carbon (NPC), based on organic xerogel compounds, was prepared at 650 ºC pyrolysis temperature by sol-gel method from pyrogallol and formaldehyde (PF-650) mixtures in water using picric acid as catalyst. The performance of NPC was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and nitrogen porosimetry. The metal uptake characteristics were explored using effective parameters including pH, contact time, initial metal ion concentration, and temperature...
January 10, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28074362/the-determination-and-fate-of-disinfection-by-products-from-ozonation-chlorination-of-fulvic-acid
#16
Xin Zhong, Chongwei Cui, Shuili Yu
Ozonation of fulvic acid (FA) can result in diverse intermediate oxidation by-products, significantly affecting disinfection by-product (DBP) formation following chlorination. The objective of this study was to provide insight into ozone reaction intermediates and reveal the possible formation pathway of DBPs from ozonation of FA due to the formation of intermediate oxidation by-products. Aldehydes, aromatic acids, short-chain acids, chloroform, and dichloroacetic acid were detected at various ozone dosage additions...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28070012/prevalence-and-risk-factors-for-intestinal-parasitic-infection-in-schoolchildren-in-battambang-cambodia
#17
Chien-Wei Liao, Kuan-Chih Chiu, I-Chen Chiang, Po-Ching Cheng, Ting-Wu Chuang, Juo-Han Kuo, Yun-Hung Tu, Chia-Kwung Fan
Most intestinal parasitic infections (IPIs), commonly endemic in tropical resource-poor developing countries, are neglected tropical diseases. Parasitic infections and malnutrition are most commonly found in children. We determined the prevalence of IPIs and the risk factors in Battambang Province, northwestern Cambodia, from August to September 2015. This study collected 308 valid questionnaires and specimens from Dontri (173, 56.2%) and Kon Kaêk (135, 43.8%) primary schools. All stool samples were examined using Chang's Feces Examination Apparatus through the merthiolate-iodine-formaldehyde technique...
January 9, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28068470/virtual-cross-linking-of-the-active-nemorubicin-metabolite-pnu-159682-to-double-stranded-dna
#18
Matteo Scalabrin, Luigi Quintieri, Manlio Palumbo, Federico Riccardi Sirtori, Barbara Gatto
The DNA alkylating mechanism of PNU-159682 (PNU), a highly potent metabolite of the anthracycline nemorubicin, was investigated by gel-electrophoretic, HPLC-UV and micro-HPLC/mass spectrometry (MS) measurements. PNU quickly reacted with double-stranded oligonucleotides, but not with single-stranded sequences, to form covalent adducts which were detectable by denaturing polyacrylamide gel electrophoresis (DPAGE). Ion-pair reverse-phase HPLC-UV analysis on CG rich duplex sequences having a 5'-CCCGGG-3' central core showed the formation of two types of adducts with PNU, which were stable and could be characterized by micro-HPLC/MS...
January 9, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28067406/ninjurin1-assembles-into-a-homomeric-protein-complex-maintained-by-n-linked-glycosylation
#19
Sung-Jin Bae, Min Wook Shin, Ran Hee Kim, Dongyoon Shin, Taekwon Son, Hee-Jun Wee, Kyu-Won Kim
Ninjurin1 (Ninj1) is a cell surface protein known as a homophilic adhesion molecule. Previous studies have shown a trans-interaction of Ninj1 between immune cells and endothelial cells; however, little is known about Ninj1 modification and structure in the cis-interaction. We showed that Ninj1 assembles into a homomeric complex via a cis-interaction mediated by the intracellular region and N-glycosylation at Asn(60) . We identified cis-interaction between Ninj1 proteins using CFP- and YFP-tagged Ninj1 by Förster resonance energy transfer using a confocal microscope and fluorescence-activated cell sorter...
January 9, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28063240/effect-of-feeding-complete-feed-block-containing-rumen-protected-protein-non-protein-nitrogen-and-rumen-protected-fat-on-improving-body-condition-and-carcass-traits-of-cull-ewes
#20
R S Bhatt, A Sahoo
Nutrient utilization, body condition and carcass traits of cull ewes were studied in three dietary regimens based on complete feed block (CFB) feeding to control (C) with rumen protected protein (RPP), CU [RPP + urea (6 g/kg)] and CUF [RPP + urea + rumen protected fat (RPF; 40 g/kg)]. The RPP component (g/kg) in C had 1% formaldehyde-treated soy flakes 50, mustard cake 50 and sesame cake 30. The mustard and sesame cakes were replaced with urea on equivalent N basis in CU and CUF. The ewes were offered ad libitum CFB composed (g/kg) of concentrate 650, roughage 300 and molasses 50...
January 7, 2017: Journal of Animal Physiology and Animal Nutrition
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